What is the root of word visibility?

The root of the word "visibility" is the Latin word "visus", meaning "sight".

Here's the breakdown:

* Visus (Latin) - sight

* Visible (English) - capable of being seen

* Visibility (English) - the state or quality of being visible

So, "visibility" essentially means the state or quality of being able to be seen, derived from the Latin word for "sight".